Question: WHICH LAGOON HAVE THE HIGHEST RESISDENCE TIME OF WATER?
Paraphrase: The lagoon with the highest resisdence time of water is?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q187223 . ?ent wdt:P3020 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Zeekoevlei